Though some economic theories link consumption / types of goods consumed to wealth level, it seems that "人们花在买衣服上的钱越来越少,这是为什么?" cannot be answered given the availability of the info stated.
It is given that "美国城市消费者的消费兴趣正从服装转向旅行和餐饮,服装店的销售额也随之下降。" The change in preferences (消费兴趣) in itself may have explained the phenomenon. It may be due to some structured / institutional change in preferences rather than economic reasons.
Perhaps it would be a good project / thesis / empirical work to explore the relationship
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